US 12,431,489 B2
Sulfur-carbon composite, method for preparing the same, and positive electrode for lithium-sulfur battery and lithium-sulfur battery comprising the same
Soohyun Kim, Daejeon (KR); and Kwonnam Sohn, Daejeon (KR)
Assigned to LG ENERGY SOLUTION, LTD., Seoul (KR)
Appl. No. 17/052,295
Filed by LG CHEM, LTD., Seoul (KR)
PCT Filed Jun. 4, 2019, PCT No. PCT/KR2019/006704
§ 371(c)(1), (2) Date Nov. 2, 2020,
PCT Pub. No. WO2020/009332, PCT Pub. Date Jan. 9, 2020.
Claims priority of application No. 10-2018-0076882 (KR), filed on Jul. 3, 2018.
Prior Publication US 2021/0234159 A1, Jul. 29, 2021
Int. Cl. H01M 4/36 (2006.01); H01M 4/02 (2006.01); H01M 4/38 (2006.01); H01M 4/583 (2010.01); H01M 4/62 (2006.01); H01M 4/66 (2006.01); H01M 10/36 (2010.01); H01M 10/44 (2006.01)
CPC H01M 4/38 (2013.01) [H01M 4/366 (2013.01); H01M 4/583 (2013.01); H01M 4/623 (2013.01); H01M 4/661 (2013.01); H01M 10/36 (2013.01); H01M 10/44 (2013.01); H01M 2004/021 (2013.01); H01M 2004/027 (2013.01); H01M 2004/028 (2013.01)] 13 Claims
OG exemplary drawing
 
1. A composite comprising:
a sulfur-carbon composite, which comprises a first porous carbon material and sulfur contained in at least a part of an inside and a surface of the first porous carbon material; and
a coating layer on the surface of the sulfur-carbon composite, which coating layer comprises a second porous carbon material and a point contact binder,
wherein the point contact binder comprises at least one selected from the group consisting of polytetrafluoroethylene, styrene butadiene rubber, carboxymethyl cellulose, polyvinylidene fluoride, and polyvinylidene fluoride-hexafluoropropylene,
wherein the second porous carbon material is present in an amount of 40% by weight to 80% by weight based on a total weight of the coating layer,
wherein the point contact binder is present in an amount of 0.5% by weight to 3% by weight based on a total weight of the sulfur-carbon composite,
wherein the coating layer has a thickness of 50 nm to 100 nm, and
wherein the sulfur-carbon composite inside the coating layer has a diameter of 10 μm to 50 μm.